Molar mass of "BaCl_2\u20222H_2O=244.26 \\ g\\ mol^{-1}"
"Molarity=\\frac{mass}{molar\\ mass\\times Volume(in\\ l)}"
"mass=molarity\\times molar\\ mass\\times volume\\\\ \\ \\ \\ \\ =0.125 \\times244.26\\times0.250=7.633\\ g"
So "7.633 \\ g" of this salt is added into water so that final volume becomes 250 ml
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